Well i ended up taking mine to Driveline services at Archerfield. They were $100+ cheaper than their Brendale branch!
The guy didnt even have to measure up, he just looked at my R34 yoke and goes "oh yeah 30 spline, same as a 300zx, replaceable with hilux ( i think) and the diff flange, oh yeah thats the same as a nissan navara, no probs, in 3" single piece capable of 9100rpm in top gear... thats about $420"
prices i was given:
Driveline Services (Archerfield)
3" single piece - $350 - $450
3" 2 piece - $450 - $550
Driveline Services ( Brendale)
3" single piece - $450 - $550
3" 2 piece - $550 - $650
pretty expensive, but i need a completely new tailshaft cuz none of the old bits can be usedf as they are pressed units, an di wanted them to be replaceable for if/when they snap